Speech Signal Encryption Using Chaotic Symmetric Cryptography
Meghdad Ashtiyani, Parmida Moradi Birgani, Seyed Siavash Karimi Madahi · 2012
With development of Information and Communication Technology, data transmission becomes more critical day by day. Higher security for transmitting data is especially required. Therefore, we propose an encryption scheme for the speech signal encryption based on combination of scrambling and confusion. Chaotic cat map is used for the scrambling the addresses of the speech signal samples. In order to provide security for the scheme, a modified form of Simplified version of Advance Encryption Standard (S-AES) is introduced and applied. The modification is that we make use of chaos for S-box design and replace it with that of S-AES. The so called Chaotic S-AES has all cryptographic characteristics and requirements of S-AES. Hence, the main contribution of this work is that we make use of chaos in both signal diffusion and confusion parts. In order to check the performance of the method, experimental implementation has been done. It worth be noting that the resistance of the scheme against differential and linear cryptanalysis is at least as of S-AES.